| 单词 | alternate base |
| 释义 | > as lemmasalternate base ΘΚΠ the world > relative properties > number > geometry > shape or figure > [noun] > element of > base > altern base altern base1630 alternate base1631 1631 R. Norwood Trigonometrie i. 33 As the difference of the true and alternate base being 90 paces, the half therefore is EB 45 paces..serving to find the angle at ℰ. 1785 C. Hutton Math. Tables 27 Napier here teaches also some new theorems in spherical trigonometry, particularly that the tangent of the base : tang. ½ sum legs : : tang. ½ dif. legs : tang. ½ the alternate base. 1826 T. Keith Introd. Theory & Pract. Plain & Spherical Trig. (ed. 5) iii. iv. 179 The distance of a perpendicular from the middle of the base, or as some writers call it the altern, or alternate base, is always equal to half the difference of the segments of the base, when the perpendicular falls within the triangle. < as lemmas |
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